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What Are the Different Types of Codes and How Do They Work? In contrast to older keys, modern car keys have specific chips in them that are specific to each vehicle. This prevents thieves from simply taking the key and turning on the car. Keys can be purchased from the dealership or cloned at the locksmith's shop. The process for programing the key differs by manufacturer and involves turning the key to the on position without starting the engine, and then removing it within a certain time period. Transponder Codes When a tran